Light bulb



FIG. 1 is a top perspective view of the present light bulb;

FIG. 2 is a side view of same, both sides being identical;

FIG. 3 is a front view of the present light bulb, the rear view being identical;

FIG. 4 is a top view of same; and,

FIG. 5 is a bottom view of the present light bulb. 

The ornamental design for light bulb, as shown and described. 